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#ifndef __NORMALISE_H
#define __NORMALISE_H
#include "expr.hh"
/* Normalise a Nix expression. That is, if the expression is a
derivation, a path containing an equivalent closure expression is
returned. This requires that the derivation is performed, unless a
successor is known. */
Path normaliseNixExpr(const Path & nePath, PathSet pending = PathSet());
/* Realise a closure expression in the file system.
The pending paths are those that are already being realised. This
prevents infinite recursion for paths realised through a substitute
(since when we build the substitute, we would first try to realise
its output paths through substitutes... kaboom!). */
void realiseClosure(const Path & nePath, PathSet pending = PathSet());
/* Ensure that a path exists, possibly by instantiating it by
realising a substitute. */
void ensurePath(const Path & path, PathSet pending = PathSet());
/* Read a Nix expression, after ensuring its existence through
ensurePath(). */
NixExpr exprFromPath(const Path & path, PathSet pending = PathSet());
/* Get the list of root (output) paths of the given Nix expression. */
PathSet nixExprRoots(const Path & nePath);
/* Get the list of paths that are required to realise the given
expression. For a derive expression, this is the union of
requisites of the inputs; for a closure expression, it is the path of
each element in the closure. If `includeExprs' is true, include the
paths of the Nix expressions themselves. If `includeSuccessors' is
true, include the requisites of successors. */
PathSet nixExprRequisites(const Path & nePath,
bool includeExprs, bool includeSuccessors);
/* Return the list of the paths of all known Nix expressions whose
output paths are completely contained in the set `outputs'. */
PathSet findGenerators(const PathSet & outputs);
#endif /* !__NORMALISE_H */
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